Plato is not the only ancient author who refers to Socrates. For a quick summary, see this Wikipedia article:
https://en.wikipedia.org/wiki/Socrates
Note the section Socrates as a Figure , which comments on the question you ask.

I don't know if most philosophers would say that she's no philosopher at all, but I suspect many would say she's a marginal philosopher. One reason is that however influential she may have been, many philosophers don't think she's a very good philosopher—not very careful or original or analytically deep—even if they happen to be broadly sympathetic to her views.
The fact that she came from outside the academy by itself wouldn't be disqualifying, but in one sense, philosophers are not just people who engage with philosophical issues; they're people who are part of a community whose members read and respond to one another (even when they disagree deeply) and interact in a variety of particular ways. Being outside the academy tends to put you outside the ongoing conversation of that community. Whether that's good, bad, or neutral is another story, but to whatever extent "philosopher" means "someone who's a member of a certain intellectual community," the fact that she was outside the academy is part,...

I fear I'm misunderstanding. The obvious answer is that Plato wrote books in which his teacher Socrates is the main character. There are many similar examples in literature. How much of what Plato attributes to Socrates was really said by Socrates is harder to say.

Perhaps you're putting more weight on the fable than fables are meant to bear. Fables are short, stylized ways of conveying a point, and the point here seems clear enough: if you come to be seen as a liar, you risk not being believed when it matters. Though I gather that there's a remark attributed to Aristotle that conveys much the same message, once again it may not be profitable to put too much weight on the fable as a device for exploring Aristotle's Ethics. The boy seems clearly to represent someone who lacks an important virtue: truthfulness. The fable doesn't really address the question of whether the townspeople also lack some virtue such as prudence or caution. In real life, we might wonder how many times the boy would have to lie before it become reasonable for the townspeople to ignore him; in the context of the fable, that's not really the point at issue.

I think there are two different issues here, so let me start with the simpler one. Suppose the lecturer said: "To the best of my knowledge—and I've read a great deal on the matter—no one has disproved Kant's claim. That seems the sort of thing one might reasonably be able to say, and might well be what the speaker meant. If so, no problem. If the speaker is claiming more or less a priori that no one has a disproof, this would be harder to swallow, but there's a way to understand it that makes it not just mere arrogance. Suppose I said: no one has disproved that 3+4 = 7. I might well mean not just that no one happens to have done this, but that no one could do it. And in fact, I'm quite sure that's right: no one could disprove it. So the speaker might have meant that Kant's claim had a status rather like "3+4=7": necessarily true, hence not disprovable. If so, I'm not sure he's right, but also not sure he's wrong. However, there's yet another possibility. To see it, ask what would count as a...

On one version of the Categorical Imperative, we're told to act only on maxims (roughly, principles of action) that we could will to be universal laws. That may or may not be the right way to think about morality; I don't have a settled opinion. However, there are philosophers who think Kant had the theory right, but fell down in applying it. Kant thought that lying is always wrong; whether the Categorical Imperative requires this is less clear. The question is whether there's a way of formulating an acceptable maxim that allows for lying in some circumstances. Kant's argument to the contrary isn't entirely convincing, to say the least. The case of homosexuality is arguably a case in point -- or more accurately, the case of homosexual sex may be a case in point. Kant thought, far as I know, that homosexual acts are always wrong. But when someone who's homosexual by orientation acts on that orientation, it's pretty implausible that their maxim, universalized, requires that heterosexuals have...

Perhaps we might start with a distinction between two things the accusation of nonsense might mean. One is that it's patently false; the other is that there's no coherent idea. Your worry is pretty clearly the latter, and I'm sympathetic: whatever exactly Jung meant, it's hard to be sure that one has gotten hold of it. With that in mind, my sense is that there's an interesting idea behind the notion of synchronicity, though not one I'm inclined to believe. Insofar as I understand it, synchronicity is meaningful coincidence . More particularly, it's meaningful coincidence between an inner state of mind and an occurrence in the outer world. By saying that synchronicities are coincidences, Jung meant that neither of the events causes the other. By saying that the coincidence is meaningful, Jung seems to mean two things. The first, and more obvious, is that the outer event corresponds in a meaningful way to the inner state. In one of Jung's well-known examples, a patient is recounting a dream about a...

I'm not sure there's much of a connection. Whether or not some things are true by virtue of meaning along and whether there are incompatible ways things could be strike me as different questions. The thought might be that if there are no analytic truths, there are no necessary truths, no impossibilities, and no meaningful distinctions between supposed possibilities, hence no notion of different possible worlds. But that seems way too quick. For starts, whether there are necessary truths and whether such truths hold by virtue of meaning alone are different questions. I can't talk myself out of thinking that "1 +1 = 2" is a necessary truth, even if I'm a lot less sure that it holds by virtue of meaning alone. I also think that "There are no more than 2 people in this room" (i.e., the one I'm in right now) and "there are at least 7 people in this room" are two different, incompatible possibilities, whether or not the analytic/synthetic distinction is real. But leave all that heady stuff aside. You...

Sure. Even if existence is not a predicate, it's at least arguable that necessary existence is. (As Norman Malcolm pointed out years ago, there really are two versions of the argument, and the second one deals with necessary existence.) We doubt that existence is a predicate because, roughly, saying that something exists tells us nothing about what it's like. Not so for necessary existence. Not just anything could exist necessarily. The computer I'm typing on is the wrong sort of thing to be a candidate for necessarily existing thing. Assuming that some things are of the right sort to exist necessarily, necessary existence would be a predicate. Whether this is a defense of the argument all things considered is another matter. But I think the point made here is fair as far as it goes. A being that merely happened to exist wouldn't be a being than which none greater can be conceived.

The key is to be careful about what Kant says. You must never use people merely as means, but must also treat them as an end in themselves. One common example is buying something in a store. I use the clerk as a means to the transaction, but I don't coerce her/him. If I did, that would be a case of using someone merely as a means. Since I take seriously the need for the clerk's (implicit) consent to the arrangement, I am also treating the clerk as an end. Networking is similar. The people in the network all consent. No one is being coerced, and so long as everyone is being truthful and otherwise decent to one another, then there's no violation of the Categorical Imperative.